Workaround: the following addon is said to fix the broken tooltips (haven't tried it):
https://addons.mozilla.org/firefox/addon/1715
The guy who fixed that issue in the addon explained to me that this is because the "noautohide" XUL attribute defaults to off (!):
https://developer.mozilla.org/en/XUL/Attribute/noautohide
As a curiosity, the bookmark toolbar tooltips have noautohide=true,
which makes the bookmark toolbar tooltips the only ones that work in all
of Firefox.
Somebody please fix, this is extremely annoying any time you try to
actually *read* a tooltip :-(.
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[firefox] tooltips disappear too fast
https://bugs.launchpad.net/bugs/239462
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